I saw a golden Rebel Baddy up at dark forest today. Of cause it had like a different name and when killed gives you a golden gralat. Also killed a big spider up at onnet 5 days ago while doing castle quest. It added 250 gralats more to the bounty. Your box shines after you kill a rare baddy and its been added to your bounty.
OH and kill 100 blobs to summon the huge blob. ;)